Color Constancy (The Wiley-IS&T Series in Imaging Science by Marc Ebner

By Marc Ebner

A human observer is ready to realize the colour of items regardless of the sunshine used to light up them. this is often known as colour fidelity. A digicam makes use of a sensor to degree the mirrored mild, which means that the measured colour at every one pixel varies in line with the colour of the illuminant. hence, the ensuing colours is probably not just like the colours that have been perceived by means of the observer. acquiring colour consistent descriptors from photo pixels is not just vital for electronic images, but in addition necessary for computing device imaginative and prescient, color-based automated item attractiveness, and colour picture processing in general.This publication offers a finished advent to the sector of colour fidelity, describing all of the significant colour fidelity algorithms, in addition to featuring innovative study within the region of colour photo processing. starting with an in-depth examine the human visible procedure, Ebner is going on to:examine the idea of colour photo formation, colour replica and varied colour spaces;discuss algorithms for colour fidelity less than either uniform and non-uniform illuminants;describe tools for shadow elimination and shadow attenuation in electronic images;evaluate a number of the algorithms for item popularity and colour fidelity and examine this to info bought from experimental psychology;set out the various algorithms as pseudo code in an appendix on the finish of the book.Color fidelity is a perfect reference for working towards engineers, computing device scientists and researchers operating within the zone of electronic colour picture processing. it may well even be worthy for biologists or scientists regularly who're drawn to computational theories of the visible mind and bio-inspired engineering platforms.

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The observers are also asked to pick the one lying halfway between the middle one and the brightest one. This is continued recursively. 21 with the pieces of papers shown at the bottom of the graph. 55. Lightness and reflectance are not linearly related. 21 Relationship between lightness and reflectance. Achromatic papers are arranged on an equally spaced lightness scale by human observers. For each paper, the corresponding reflectance is shown in the graph (data from Land 1974). for some constant k (Hunt 1957).

Specialization in the visual cortex of the rhesus monkey is given by Zeki (1978). Similar functional specialization is also found in the human visual cortex (Zeki et al. 1991). V1 mainly connects to area V2, which surrounds V1 (Tov´ee 1996). Area V2 seems to be organized into three types of stripes, the so-called thick, thin, and interstripes. The stripes seem to be used to process visual orientation (thick stripes), color (thin stripes), and retinal disparity (interstripes). Adjacent stripes respond to the same region of the visual field.

Reproduced by permission from Massachusetts Institute of Technology. D. C. Van Essen and E. A Deyoe. Concurrent Processing in the Primate Visual Cortex. M. S. ), The Cognitive Neurosciences, The MIT Press, pp. 19 What and where pathways of the primate brain. The what pathway starts at V1 and passes through the inferior temporal cortex. The where pathway passes through ´ the posterior parietal cortex. (Reprinted with permission from F. A. W. Wilson, S. P. O Scalaidhe, and P. S. Goldman-Rakic. Dissociation of object and spatial processing domains in primate prefrontal cortex.

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